Airport spokeswoman JoAnn Jenny said the woman was seriously injured just before 9 p.m. and taken to Allegheny General Hospital in Pittsburgh.

The victim's grandmother identified the woman as 21-year-old Modesty Colquitt, a nursing student at the University of Pittsburgh.

"She lost a lot of blood. My baby is still not out of the woods. She was a real sick girl when they brought her here last night," Noel Wilson told Pittsburgh's Action News 4.

Colquitt was driving a vehicle known as a "tug" when she was hurt. But Jenny said the vehicle wasn't towing an aircraft at the time, and the wreck didn't disrupt any flights or endanger any passengers.

Allegheny County police said Colquitt was working for JetStream Ground Services.

Like her granddaughter, Wilson once held the same position and is upset someone from the company didn't ride to the hospital with her.

"I worked with US Air and I've been to the hospital with people, and when somebody gets hurt, they send somebody with them," said Wilson.

CAUGHT IN THE MIDDLE ARE SAYING. FIGHTING TO RECOVER TONIGHT, A WORKER AT PITTSBURGH INTERNATIONAL AIRPORT PINNED BENEATH A VEHICLE, RUSHED TO THE HOSPITAL WITH SERIOUS INJURIES. GOOD EVENING, EVERYBODY, I'M WENDY BELL. I'M MIKE CLARK. TRAPPED ON THE RUNWAY, FRFS FREED THE 21-YEAR-OLD NURSING STUDENT. POLICE ARE STILL INVESTIGATING HOW THIS ALL HAPPENED. PITTSBURGH ACTION NEWS 4 REPORTER SHELDON INGRAM JOINED US LIVE. Reporter: FIRST OF ALL, THERE'S A QUESTION AS TO HOW THIS VEHICLE OVERTURNED AT PITTSBURGH INTERNATIONAL AIRPORT. THE WOMAN WHO WAS DRIVING THAT VEHICLE IS RECOVERING FROM HER FIRST ROUND OF SURGERY. THEY'RE CALLED TUG VEHICLES. AIRPORT PERSONNEL USE THEM TO PULL LUGGAGE CARTS TO AND FROM AIRCRAFT. LAST NIGHT JUST BEFORE 9:00, ONE OF THESE TUGS OVERTURNED. PINNING THE DRIVER UNDERNEATH. SHE LOST A LOT OF BLOOD, OH, YES. MY BABY WAS -- MY BABY IS STILL NOT OUT OF THE WOODS, OKAY? SHE WAS A REAL, REAL SICK GIRL WHEN THEY BROUGHT HER LAST NIGHT. Reporter: SHE REACTS EMOTIONAL TO THE ACCIDENT. THE INJURED DRIVER IS HER GRANDDAUGHTER, 21-YEAR-OLD, A NURSING STUDENT AT THE UNIVERSITY OF PITTSBURGH. COUNTY POLICE SAY SAID SHE WORKS FOR JET STREAM GROUND SERVICES, WHO HANDLE GROUND OPERATIONS FOR MULTIPLE AIRLINES. POLICE THINK SHE OPERATED A TUG FOR U.S. AIRWAYS. HER GRANDMOTHER IS UPSET BECAUSE NO ONE FROM JET STREAM RODE WITH HER TO THE ALLEGHENY HOSPITAL IN THE AMBULANCE. I KNOW PROPER PROCEDURES, YOU KNOW. AND THAT'S WHAT SHOULD HAVE HAPPENED. SOMEBODY FROM THAT COMPANY SHOULD HAVE BEEN IN THAT AMBULANCE WITH MY DAUGHTER. Reporter: WILSON SAYS SHE SPEAKS FROM EXPERIENCE. SHE'S RETIRED. BUT SHE ONCE HELD THE SAME JOB AS HER GRANDDAUGHTER WHO WAS INJURED AFTER THE TUG VEHICLE FELL ON TOP OF HER. I WORKED FOR U.S. AIR. AND I'VE BEEN TO THE HOSPITAL WITH PEOPLE. AND WHEN WE GO, WHEN SOMEBODY GET HURT, WE ALL SEND SOMEBODY WITH THEM. Reporter: BUT THEY SENT YOUR GRANDDAUGHTER BY HERSELF. HERSELF. Reporter: SHE'S SCHEDULED FOR YET ANOTHER SURGERY PROCEDURE TOMORROW. IN THE MEANTIME WE REACHED JET STREAM AT THE CORPORATE HEADQUARTERS IN FLORIDA. BUT THEY SAID THEY WOULD NOT